Add basic stacktrace handler using libunwind.

tests/skia_test.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
+#include "CrashHandler.h"
 #include "OverwriteLine.h"
 #include "SkCommandLineFlags.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
 #include "SkTArray.h"
 #include "SkTemplates.h"
 #include "SkThreadPool.h"
 #include "SkTime.h"
 #include "Test.h"
 
@@ skipping 107 matching lines @@
         return false;
     }
     if (!FLAGS_gpu && isGPUTest) {
         return false;
     }
     return true;
 }
 
 int tool_main(int argc, char** argv);
 int tool_main(int argc, char** argv) {
+    SetupCrashHandler();
     SkCommandLineFlags::SetUsage("");
     SkCommandLineFlags::Parse(argc, argv);
     Test::SetResourcePath(FLAGS_resourcePath[0]);
 
 #if SK_ENABLE_INST_COUNT
     if (FLAGS_leaks) {
         gPrintInstCount = true;
     }
 #endif
 
@@ skipping 86 matching lines @@
 
     SkDebugf("\n");
     return (failCount == 0) ? 0 : 1;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif